Not wishing to get into a debate here, but policing has always been a dangerous profession. If you look at some figures, you’ll see more cops killed during WWII than in the last five years. And that wasn’t being shot at by the Nazi’s.
What seems to be fashionable these days, as already mentioned is single crewing. Although its being speculative this happened here.
Single crewing happened for me during the early 90’s. When I questioned a Senior officer, he said it was risk management; ‘you take the risk, I manage it’. The only reason for single crewing, is resourcing or lack of it.